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ReferFilter.java
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85 lines (67 loc) · 2.69 KB
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package org.joychou.filter;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import org.apache.commons.lang.StringUtils;
import org.joychou.config.WebConfig;
import org.joychou.security.SecurityUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.AntPathMatcher;
import org.springframework.util.PathMatcher;
/**
* Check referer for all GET requests with callback parameters.
* If the check of referer fails, a 403 forbidden error page will be returned.
* <p>
* Still need to add @ServletComponentScan annotation in Application.java.
*/
@WebFilter(filterName = "referFilter", urlPatterns = "/*")
public class ReferFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
private final Logger logger = LoggerFactory.getLogger(this.getClass());
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain)
throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
String refer = request.getHeader("referer");
PathMatcher matcher = new AntPathMatcher();
boolean isMatch = false;
// 获取要校验Referer的Uri
for (String uri : WebConfig.getReferUris()) {
if (matcher.match(uri, request.getRequestURI())) {
isMatch = true;
break;
}
}
if (!isMatch) {
filterChain.doFilter(req, res);
return;
}
if (!WebConfig.getReferSecEnabled()) {
filterChain.doFilter(req, res);
return;
}
// Check referer for all GET requests with callback parameters.
String reqCallback = request.getParameter(WebConfig.getBusinessCallback());
if ("GET".equals(request.getMethod()) && StringUtils.isNotBlank(reqCallback)) {
// If the check of referer fails, a 403 forbidden error page will be returned.
if (SecurityUtil.checkURL(refer) == null) {
logger.info("[-] URL: " + request.getRequestURL() + "?" + request.getQueryString() + "\t"
+ "Referer: " + refer);
response.setStatus(HttpServletResponse.SC_FORBIDDEN);
response.getWriter().write(" Referer check error.");
response.flushBuffer();
return;
}
}
filterChain.doFilter(req, res);
}
@Override
public void destroy() {
}
}